<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品添加</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>

      <!-- 步骤条区域 -->
      <el-steps :space="200" align-center :active="activeIndex - 0" finish-status="success">
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form
        ref="addFormRef"
        :model="addForm"
        :rules="addFormRules"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类">
              <el-cascader
                expandTrigger="hover"
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="(item,i) in manyTabData" :key="i">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox v-for="(cb,i) in item.attr_vals" :key="i" :label="cb" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 
              action:上传的后台接口
            -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="addBtn" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" style="width:100%" alt />
    </el-dialog>
  </div>
</template>

<script>
import _ from "lodash";

export default {
  data() {
    return {
      activeIndex: "0",
      // 添加表单得数据对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: "",
        attrs: []
      },
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" }
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" }
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" }
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" }
        ]
      },
      // 商品分类数据
      cateList: [],
      cateProps: {
        label: "cat_name",
        value: "cat_id",
        children: "children"
      },
      // 动态参数数据
      manyTabData: [],
      // 静态属性数据
      onlyTabData: [],
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: sessionStorage.getItem("token")
      },
      previewPath: "",
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      // 控制图片预览框的显示与隐藏
      previewVisible: false
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    getCateList() {
      this.$http.get("categories").then(res => {
        var res = res.data;
        if (res.meta.status !== 200) {
          return this.$message.error("获取商品分类数据失败");
        }
        // this.$message.success('获取商品分类数据成功')
        this.cateList = res.data;
      });
    },
    // 级联选择器变化会触发
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
      }
    },
    // 切换标签页面板时触发，用于拦截或放行跳转下一个页面
    beforeTabLeave(activeName, oldActiveName) {
      /* 
        oldActiveName：即将离开得标签页名称也就是 el-tab-pane 的 name值
        activeName：即将进入的标签页名称
      */
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请选择商品分类");
        return false;
      }
    },
    // 点击标签面板的时候触发
    tabClicked() {
      // 访问的是动态参数面板
      if (this.activeIndex === "1") {
        this.$http
          .get(`categories/${this.cateId}/attributes`, {
            params: { sel: "many" }
          })
          .then(res => {
            var res = res.data;
            if (res.meta.status !== 200) {
              return this.$message.error("获取动态参数列表失败");
            }
            res.data.forEach(item => {
              item.attr_vals =
                item.attr_vals.length !== 0 ? item.attr_vals.split(" ") : [];
            });
            this.manyTabData = res.data;
            console.log(this.manyTabData);
          });
      } else if (this.activeIndex === "2") {
        this.$http
          .get(`categories/${this.cateId}/attributes`, {
            params: { sel: "only" }
          })
          .then(res => {
            var res = res.data;
            if (res.meta.status !== 200) {
              return this.$message.error("获取静态属性列表失败");
            }
            this.onlyTabData = res.data;
          });
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url;
      this.previewVisible = true;
    },
    // 处理移除图片效果
    handleRemove(file) {
      // 1，获取图片的临时路径
      const filePath = file.response.data.tmp_path;
      // 2，从 pics 数组中，找到这个图片的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath);
      // 3，调用数组的 splice 方法，根据得到的索引值进行删除操作
      this.addForm.pics.splice(i, 1);
    },
    // 图片上传成功的事件
    handleSuccess(response) {
      const picInfo = { pic: response.data.tmp_path };
      this.addForm.pics.push(picInfo);
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(valid => {
        if (!valid) {
          return this.$message.error("请填写必要的表单项~");
        }
        // 执行添加的业务逻辑

        /* 错误的执行代码
          addForm.goods_cat已经绑定到了 v-model 中，
          但是我们的v-model只识别数组，所以这里转为字符串后，就会报错
          所以我们在这里使用深拷贝 lodash
          this.addForm.goods_cat = 
          this.addForm.goods_cat.join(',')
        */

        // 使用深拷贝
        const form = _.cloneDeep(this.addForm);
        // 将分类id数组用 , 进行字符串分割
        form.goods_cat = form.goods_cat.join(",");
        // 处理动态参数
        this.manyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(" ")
          };
          this.addForm.attrs.push(newInfo);
        });
        // 处理静态属性
        this.onlyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          };
          this.addForm.attrs.push(newInfo);
        });
        form.attrs = this.addForm.attrs

        // 发起添加商品的请求
        // 商品的名称必须是唯一的
        this.$http.post('goods',form).then(res=>{
          var res = res.data
          console.log(res)
          if(res.meta.status !== 201){
            return this.$message.error('添加失败,'+res.meta.msg)
          }
          this.$message.success('添加成功')
          this.$router.push('/goods')
        },err=>{ this.$message.error('添加失败')})
      });
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    }
  }
};
</script>

<style lang="scss" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}

.addBtn {
  margin-top: 15px;
}
</style>